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	1	/*
	2	* Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 2.0 (the "License"). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License.
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24
	25	#include "libsaio.h"
	26
	27	/*
	28	* Convert zero-based linear address to far pointer.
	29	*/
	30	#define GET_FP(x) ( (((x) & 0xffff0000) << (16 - 4)) \| ((x) & 0xffff) )
	31
	32	/*==========================================================================
	33	* Issue a command to the network loader.
	34	*
	35	* The 'cmd' command structure should be allocated on the stack to
	36	* ensure that it resides within the addressable range for the
	37	* network loader, which runs in real mode.
	38	*/
	39	static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)
	40	{
	41	loader(code, GET_FP((UInt32) cmd));
	42
	43	// Must re-enable the A20 address line, the PXE firmware will
	44	// disable the A20 line control.
	45	//
	46	enableA20();
	47
	48	return cmd->header.status;
	49	}
	50
	51	/*==========================================================================
	52	* Unload Base Code Stack command.
	53	*/
	54	UInt32 nbpUnloadBaseCode()
	55	{
	56	return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);
	57	}
	58
	59	/*==========================================================================
	60	* TFTP Read File command.
	61	*/
	62	static long NBPLoadFile(CICell ih, char * filePath)
	63	{
	64	nbpCommandTFTPReadFile_s cmd;
	65	UInt32 ret;
	66
	67	strcpy((char *)cmd.filename, filePath);
	68	cmd.status = nbpStatusFailed;
	69	cmd.bufferSize = TFTP_LEN;
	70	cmd.buffer = TFTP_ADDR;
	71
	72	verbose("Loading file: %s\n", filePath);
	73
	74	ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);
	75
	76	return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;
	77	}
	78
	79	/*==========================================================================
	80	* GetDirEntry is not supported.
	81	*/
	82	static long NBPGetDirEntry(CICell ih, char * dirPath, long * dirIndex,
	83	char ** name, long * flags, long * time,
	84	FinderInfo * finderInfo, long * infoValid)
	85	{
	86	return -1;
	87	}
	88
	89	//==========================================================================
	90
	91	static void NBPGetDescription(CICell ih, char * str, long strMaxLen)
	92	{
	93	sprintf( str, "Ethernet PXE Client" );
	94	}
	95
	96	//==========================================================================
	97
	98	BVRef nbpScanBootVolumes( int biosdev, int * countPtr )
	99	{
	100	static BVRef gNetBVR = NULL;
	101
	102	if ( countPtr ) *countPtr = 1;
	103
	104	if ( !gNetBVR )
	105	{
	106	gNetBVR = malloc( sizeof(*gNetBVR) );
	107	if ( gNetBVR )
	108	{
	109	bzero(gNetBVR, sizeof(*gNetBVR));
	110	gNetBVR->biosdev = biosdev;
	111	gNetBVR->flags = kBVFlagPrimary \| kBVFlagNativeBoot;
	112	gNetBVR->description = NBPGetDescription;
	113	gNetBVR->fs_loadfile = NBPLoadFile;
	114	gNetBVR->fs_getdirentry = NBPGetDirEntry;
	115	}
	116	}
	117	return gNetBVR;
	118	}